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This is in good agreement with the value calculated above, thereby providing evidence to support time dilation.
 
This is in good agreement with the value calculated above, thereby providing evidence to support time dilation.
   −
===Length contraction===
+
==Length contraction==
 
When two inertial reference frames move past each other in a straight line with constant relative velocity, an observer in one reference frame would observe a metre rule in the other frame to be shorter.
 
When two inertial reference frames move past each other in a straight line with constant relative velocity, an observer in one reference frame would observe a metre rule in the other frame to be shorter.
  
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